More info -- this happens when queing multiple sequences in Media Encoder. Doesn't seem to happen when I export individually out of premiere.
I'm getting this when exporting out from After Effects, via Adobe Media Encoder. The pops were not in any way connected to cuts or effects in the timeline, it was just a steady poppping every second or so. I fixed it by changing the audio type from AAC to MPEG in the AME export settings window. I had also previously changed my audio file in the After Effects project from .mp3 to .wav, so I don't know if it needs both those things in place, or whether changing the audio type would have worked with the .mp3 anway?
Check your audio levels in Premiere with Audio Meters.
At any point, is your audio clipping? (hitting the utmost top red part of your audio meters and triggering the clipping indicators at the top?) If so, that's likely the reason why, and you would need to lower your audio or apply a limiter to make sure your audio is not clipping.
Thanks but the audio isn't clipping. The reason I think this is a bug is that the pops change location when I export the sequence.
I can confirm the same, no audio is clipping at all in the orginal source composition in After Effects. The pops also just move location for each export. The only thing that seems consistent for each export is that they don't start until after about the first 5 seconds of the video.
what are your source's sampling rates? And what are the sampling rates of your export? always use an audio format that's uncompressed like aiffs or .wavs.
What happens if you take on of those problematic sequences and go to File > Export using the settings on the attached image? If you import that audio and place it on the timeline and mute the original audio, can you see any dropouts in the audio wave forms and how does it sound?
I have seen this happen when the hard disk were the original media is slow or when using some audio effects, or both combinations.